Jack



FIG. 1 is a top, perspective view from the right, showing an embodiment of my new design;

FIG. 2 is a perspective view as in FIG. 1, on an enlarged scale, showing the lower portion thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image; and,

FIG. 4 is a top, perspective view thereof.

The rear and bottom of the jack are plain and unornamented.

The handle is partially shown in FIGS. 1 through 4 for convenience of illustration. 

The ornamental design for a jack, as shown and described. 